Lennox g40. some time noheat, house is cold and themostart is calling and blows cold air. led lights are normal. what is the proberlems?Post created: 2013-01-22 Type of Equipment: Furnace Views: 161
This question was created on the page: https://www.furnacecompare.com/furnaces/lennox/g43.html.
On 2013-01-23 JB wrote:
This could be a faulty control board or maybe a blockage somewhere in the furnace. Are you sure the LED diagnostic display does not indicate a problem? Does the pilot light ignite or is the blower the only part that operates?
To learn more you can take a look at this help page: http://diy.stackexchange.com/questions/4344/why-is-my-lennox-g40uh-series-furnace-not-turning-on.
More than likely you will need a certified HVAC tech to come and diagnose the problem, especially if the control board is not operating properly. You may be able to call one and simply ask what you could do before having one come out.
To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present. To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.